Correct option is D
Correct Answer: (D) PGAL
Explanation:
The Calvin Cycle is the stage of photosynthesis where plants use CO₂ to make sugar in the chloroplast stroma.
The main product formed at the end of the cycle is Glyceraldehyde-3-phosphate (PGAL or G3P).
PGAL is a 3-carbon sugar molecule.
This PGAL later helps the plant make glucose, sucrose, and starch.
Important fact:
For every 3 CO₂ molecules, the cycle produces 6 PGAL molecules:
1 PGAL leaves the cycle to form sugars.
5 PGAL are used to regenerate RuBP so the cycle can continue.
Why other options are incorrect:
A. PGA → First stable compound formed, not the final product.
B. ADP + NADP⁺ → These are by-products after ATP and NADPH are used.
C. RuBP → Starting CO₂ acceptor molecule that is regenerated.
English
100 Questions
125 Marks
80 Mins
